If you're into analytics and data processing and want to learn something new, I would recommend Clojure[0]+Incanter[1].

Also, check out Cascalog[2]. Data processing on hadoop clusters has never been this simple and fun. Much better than Pig/Cascading/etc.

[0] http://clojure.org/ [1] http://incanter.org/ [2] http://cascalog.org/